I think firstly you should check the compitition for your targeted keywords... Secondly you should select your website targeted pages to target those keywords. Ensure about the targeted pages that they are relevent for those keywords or not. After that perform on page optimization process and off page activities. Don't forget to put relevant and quality content on your website. Off page activities like Article posting, Bookmarkings, Link Building, Forums, Blogs posting etc... can help you lot to pull out web traffic.
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